Slitting Machine Guide

Slitting machine often refers to metal coil slitting machine in the metal working sector. There are mainly two kinds of metal working processes. One is metal cutting which we all are familiar such as turning, milling, and drilling. And the other is forming, such as slitting, pressing, and drawing. The slitting of metal coil belongs to forming process.

What is a Coil

Metal coil is a form of metal materials which are coiled into an assembled roll. The reasons why they are made into a coil is mainly due to convenient purposes. It makes easier for consumers to deliver their raw materials on the delivery. Once it was all processed by manual operation, but now the process is more or less by computer programs. So in the metal forming industry today, automatic metal coil slitting lines are widely applied in all kinds of industrial usages for the best convenience in manufacture. The structure of metal coil slitting is much like roll slitting. It is basically a shearing operation that cuts a large roll of materials into narrower rolls for industrial users.

Log Slitting vs. Rewind Slitting

In the slitting inventory, there are two types of methods that slit materials. The two are commonly known as log slitting and rewind slitting. Regarding the log slitting case, the roll of material is treated as a whole part and one or more slices are taken from it without an unrolling procedure. The rewind slitting case is different from the log one. The web is unwound and run through the machine. It passes through knives or lasers, and it is done before being rewound on one or more shafts to form the narrower rolls. When metal coils are to be slit, the coil toll will be rewound out of the roll and then the slit mechanism works to cut the coil into pieces.

Further Steps

The multiple narrower strips of material may be known as the multiple or pancakes if their diameter is much more than their width. For the slitting of hard materials, such as sheet metal materials, blades cannot be used as the cutting tools. Rather, a modified form of shearing is utilized in such case. Two cylindrical rolls with matching ribs and grooves are applied to cut a large roll into multiple narrower rolls. This continuous production process is economic and most importantly, precise enough.

This is usually more precise than most other cutting processes people have. Nevertheless, the occurrence of rough edges known as burrs are commonplace on slit edges. And the geometry of these rolls is determined by specific tolerances in addition to the type of material and work piece thickness values.


If the materials are soft, it is another story. For the soft materials there are several methods which are available for soft materials slitting, such as plastic films, textiles, adhesive tapes, and paper. Razor blades, straight, or circular blades are widely adopted, and some blades cut through the material while others crush the material against a hard roll.

Those are more similar to knives in an extent but still exist other differences. Moreover, the cutting blades can be set to a desired width, and some machines have many blades and can produce a number of output rolls at once, so the slit materials are rewound on paper, plastic or metal cores on the exit side of the machine devices.

Lower Costs

This process is adopted due to its lower cost and high precision for mass production business model, and some machines have a program that monitors the blades and sharpens the blades in order to maintain the quality and precision level of the cut. Based on the industry and the product that is being slit, these machines can operate between 10 m per minute and 5000 m per minute, depending on the materials.

The machines can also incorporate extensive automation mechanisms to precisely control material tension. They can work automatically to position the slitting knives, and automatically align the cores on which the material is wound and to reduce manual handling of the rolls. The more automatic it is, the fewer expenses manufacturers spend. As a result, people are enthusiastic on the process of making the production line automatic and help their users to operate with less energy consumption.

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